Author: jhb
Date: Sat Nov 12 00:23:09 2016
New Revision: 308565
URL: https://svnweb.freebsd.org/changeset/base/308565
Log:
Allow scheduling during early boot.
- Send IPI wakeups once SMP is started even if cold is true.
- Permit preemptions when cold is true.
These changes are needed for EARLY_AP_STARTUP.
MFC after: 2 weeks
Sponsored by: Netflix
Modified:
head/sys/kern/sched_4bsd.c
Modified: head/sys/kern/sched_4bsd.c
==============================================================================
--- head/sys/kern/sched_4bsd.c Sat Nov 12 00:14:13 2016 (r308564)
+++ head/sys/kern/sched_4bsd.c Sat Nov 12 00:23:09 2016 (r308565)
@@ -326,7 +326,6 @@ maybe_preempt(struct thread *td)
* - The current thread has a higher (numerically lower) or
* equivalent priority. Note that this prevents curthread from
* trying to preempt to itself.
- * - It is too early in the boot for context switches (cold is set).
* - The current thread has an inhibitor set or is in the process of
* exiting. In this case, the current thread is about to switch
* out anyways, so there's no point in preempting. If we did,
@@ -347,7 +346,7 @@ maybe_preempt(struct thread *td)
("maybe_preempt: trying to run inhibited thread"));
pri = td->td_priority;
cpri = ctd->td_priority;
- if (panicstr != NULL || pri >= cpri || cold /* || dumping */ ||
+ if (panicstr != NULL || pri >= cpri /* || dumping */ ||
TD_IS_INHIBITED(ctd))
return (0);
#ifndef FULL_PREEMPTION
@@ -1105,7 +1104,7 @@ forward_wakeup(int cpunum)
if ((!forward_wakeup_enabled) ||
(forward_wakeup_use_mask == 0 && forward_wakeup_use_loop == 0))
return (0);
- if (!smp_started || cold || panicstr)
+ if (!smp_started || panicstr)
return (0);
forward_wakeups_requested++;
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